Not an assistive device per se, but my husband finds his one shirt with snap fasteners a lot easier to deal with than those with buttons. Unfortunately, his arms are relatively short, so it is almost impossible to find snap-fastened shirts that fit; an XL has ridiculously long sleeves, and I can't find anywhere that has snap-fastened shirts sold by collar/sleeve sizes.
Also polo shirts, but again, with the same sleeve length problem.
Does anyone have any suggestions/brands?